Open-hearth furnace is reached with firebrick repair the introduction

Open-hearth furnace is the forge that cast iron and useless steel gas refine becomes steel, open-hearth furnace basically is changed by frit room. Furnace head reachs ascendant road. Sedimentary room. The part such as regenerator, flue is comprised, open-hearth furnace also calls Martin furnace, be with gas or heavy oil is fuel, become cast iron and useless steel smelt the furnace of refine of a kind of be in harmony of steel. It is according to what fusion workshop uses the type of fireproof material to be able to be divided acidity and alkalescent two kinds. But the fireproof data that these a few kinds of structures use is as follows:


1. forge uses fireproof data. Smelt workshop wait for composition by bath, boiler setting, roof, it is the main component of open-hearth furnace, working temperature is in 1700~1750 ℃ . Burner is comprised by hearth and earthy bank, its job temperature is controlled in 1600 ℃ . The body of build by laying bricks or stones that shows this one position please erodes along with the change of temperature, machinery the influence that reachs chemistry to corrode. Hearth structure is complex formula, preexistence furnace casing spreads an asbestine board on armor plate, do firebrick of clay of build by laying bricks or stones again, again magnesia brick of build by laying bricks or stones. Dike uses magnesia brick fault to seam flat build by laying bricks or stones entirely. Boiler setting is the body of bricky build by laying bricks or stones that points to above of range of bank of door of fused room furnace door, rely on levee, roof closely, temperature 1700 ℃ . All furnace walls are magnesia brick dry build by laying bricks or stones. The working temperature of roof is 1700~1750 ℃ . Besides be affected choppily by high temperature and periodic temperature, roof also is learned to corrode by the slaggy liquefaction reaching steel of slop, high temperature air current erodes etc, consequently corrode of here Yi Rong flakes, this is the weak point of system of fused room line, roof is used intermediate magnalium brick and build by laying bricks or stones of magnalium chromic brick are built. 2. The fireproof material of furnace head and condole be of use. Furnace head and the passageway of body of build by laying bricks or stones of a brick that ascendant path is join steel-making room and sedimentary room, its job temperature is in 1450~1700 ℃ , often use brick of magnesia brick, magnalium and build by laying bricks or stones of magnesian chromic brick to build. 3. Use at the fireproof material of sedimentary room. Broken bits room is a kind of deposit and slaggy equipment, its room top and ascendant path lower end are conterminous, normally working temperature is 1450 ℃ . Top of the room that burn broken bits uses the vaulted structure that magnalium brick and tall aluminous brick make, wall body uses build by laying bricks or stones of tall aluminous brick to build, bottom uses alkalescent brick to make covering layer. Sedimentary room bottom uses argillaceous brick build by laying bricks or stones to build commonly, working layer uses magnesia brick, erode in order to prevent slag.
Smooth furnace uses firebrick of firebrick open-hearth furnace of body of build by laying bricks or stones destroying basically is slaggy erode with the chemistry of steel fluid reach intertropical frit corrode or flake change is become, open-hearth furnace carries easy attaint on the head, it is the weak axis of complete lining, matter to the productivity of furnace directly, accordingly, all regard roof life as domestic and internationally the essential technology of open-hearth furnace index, in 20 centuries 60 time, open-hearth furnace of world each country uses alkaline type firebrick normally build by laying bricks or stones is built. To roof firebrick, we say for open-hearth furnace. Many furnace use firebrick of chemical felt magnalium, and the west is used firing magnesian chromic firebrick, japan uses iron portfolio Fu not to burn magnesian chromic firebrick, this kind of firebrick is OK and heatproof flake it is better to use the effect; Russia open-hearth furnace makes furnace top one number with firebrick of aluminium magnesium pointed spar; The roof of our country uses tall aluminous brick commonly, the roof life that furnace waits for in making achieves 1000 furnace second fluctuation. To 1950, open-hearth furnace its fusion room. Upside of furnace head, regenerator all uses silica brick build by laying bricks or stones to build, regenerator. The place such as bottom uses argillaceous brick or build by laying bricks or stones of tall aluminous brick is built, friend says acidity open-hearth furnace, service life is inferior, furnace of furnace life 100~200 second. German hair understands open-hearth furnace steel-making. This kind of method basically is used in vitreous forge, OK and managing the fuel of 50% . This invention is used at steel-making, it is in body of heater two end install to place " grid " regenerator, this regenerator heats by the steam of steel-making furnace eduction, next the air that warm-up enters furnace. When undertaking solid fuel experiments, very not successful, also have a lot of problems, if furnace ash jams brick of second birth room. French Martin undertook transforming to body of heater 1864, use Williams · Xi Menzi, used law of accumulation of heat to become cast iron and scrap iron refine high quality steel. WilliamSimeni produced cast iron and iron ore successfully 1868. Such steel-making method is called " Xi Menzi---Law of steel-making of equestrian fourth law " . Because its appearance is inferior, and have the bath with outspread level, friend says " open-hearth furnace " . This steel-making method says again " law of open-hearth furnace steel-making " . Law of open-hearth furnace steel-making, station put together is red: 80% for open-hearth furnace steel. Converter of aerobic top-blown type begins go into operation at the beginning of 50 time, since 60 time, open-hearth furnace lost its main body status gradually. On the world a lot of countries already or replacing converter of open-hearth furnace, oxygen stage by stage.
Flat fusion craft adopts measure of fusion of the aggrandizement that blow oxygen in open-hearth furnace to the influence of fireproof material hind, crop increases, fuel also decreases apparently. But, accompanying the leap of furnace grey amount, slaggy go out with steel splashing serious, temperature of the chamber of a stove or furnace is elevatory, lining uses state aggravation, especially roof damage is more serious. Play the requirement of craft of oxygen aggrandizement fusion to satisfy open-hearth furnace, must from improvement proceed with of structure of body of heater, raise lining fireproof material quality. Follow craft of smelt of aggrandizement open-hearth furnace use, open-hearth furnace also is changed somewhat with fireproof material, make fireproof material forward high-grade change directional development, brick of if a variety of direct union, fusion is magnesian chromic brick, magnalium pointed spar. Lining of gush filling open-hearth furnace also is a kind of when improve furnace life significant step, use gush of half dry, blaze to fill at present wait for a method, its gush filling agent is given priority to with magnesian pink commonly. Build technology of refine open-hearth furnace, serving as technical object to be returned basically is skill model, roof changes. Hearth melt is repaired wait to must rely on artificial operation, devoted manpower have the aid of at power shovel. Projectile machine throws hearth to repair the current situation when using fireproof material to be become in order to react. When hearth is repaired, should use a variety of fireproof data () of pulverous, grain. The dolomite that has mix into tar with power shovel and the magnesia that suffer from salt put heat inside, this practical and new-style but will unripe dolomite is firing dolomite is arenaceous projectile at hearth repair place. These repairing can promote the agglomeration inside furnace with fireproof material, to improve repair result, a few ferric oxide broken bits are joined in hearth part, join a few ferric oxide broken bits through be in hearth place in order to improve repair result. Although still be not had at present (conglutinate is led) long treatment involving the use of tonics to restore the patient's health, but can conclude its effect, because the concentration of MgO increased in slagging material,this basically is, rise to prevent the action with fireproof fused material thereby. Filling makings, use at open-hearth furnace.
The composition of fettling raw material and agglomeration makings are different however, repair open-hearth furnace certain part (battlements of the wall that be like besmear, rear wall) uses data, its composition is different from agglomeration material. Alkaline type furnace is with the principal component of filling charging high-grade and fireproof alkaline talent skill: Magnesia, dolomite reachs neuter material chromic mine. Inspect the utility difference of talent skill, of alterable mixture deserve to compare, grain forms the character with bond. The magnesia that repair furnace slope uses and dolomite mixture, can use the coal tar of 5% as sometimes binder. In addition, to synthesize crystallization wearing quickly, be in to the mix into in makings a few open-hearth furnace broken bits (5~10%) . When battlements of the wall before building a wall, should take a filling furnace charge, be by the makings of arenaceous composition of the magnesia brick of attaint or metallurgy subscriber, or by both in a kind of material and chromium mix and become. Mandatory point out, in the mixture of magnesia and chromic ore, magnesian content is about indigent, patch and inkstone body caking property are good: Need to be changed with magnesia only makings can. This kind of plain binder is 5~10% plasticity saggar or milk of lime. Content of reasonable filling charging mud is little, because of the alumina in clay. Oxidation silicon and ferric oxide and slag produce effect, synthesized glass of easy dissolve frit, cause filling makings to slide consequently.